o Initialize the alias and ParentIdAndRdn caches in the AbstractBTreePartition class
o Fixed NPE when those caches are not existing
o Updated the alias cache when some aliases are added/removed
o A small improvement in the dropMovedAliasIndices method = don't do two reverseLookup
o Used the alias cache in the SubtreeScopeEvaluator and the DefaultSearchEngine

git-svn-id: https://svn.apache.org/repos/asf/directory/apacheds/trunk@1547278 13f79535-47bb-0310-9956-ffa450edef68